Flight range prediction of aircraft with modernized engines

The paper proposes a method of flight range estimating for remotorized aircraft in view of static aeroelasticity. A method is based on interrelated aerodynamic model and the elastic variable density body model. The issues of ensuring the reliability of calculations by the developed technique is discussed. The performance of the method is confirmed by comparing the results of calculations with known technical characteristics of the aircraft. Results of parametric studies swept wing aircraft IL-76TD-90VD and A320neo with different aspect ratio values. The studies were performed using special software.